IB Spread Trader help?

Anyone familiar enough with IB SpreadTrader, to help me figure out how to use this thing? I'm trying to put in a strangle in June crude futures.

1. So, I type in 'CL' as underlying.
2. Futures Options Combo -> NYMEX (USD)
3. Select 'Strangle'.
4) Month '20100517'
5) I just pick call strike as 90.
6) select one of the strategies that pop up.. for example put at 80.
7) Click next.
8) Up pops a dialog:

"Configure table variables [Month - 20100517, Call Strike - 90.0]"

Put strike: column variable, row variable, or fixed value.

No matter what I pick for put strike, I'm screwed. Doesn't work. "At least one selection should be row variable", or "column variable".

How do I make this thing go?
 
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